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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed678c168138b57bb640e2de8fd649807fc1e8e1bc4f64685b0ab16b13dc59c3' 
  AND token = 'uI/c0CL2kjp5I84/0YadkJpJmssfDRo+i+RDiMvHt5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}